Uni-Ball Vision Elite Stick Bold Point Roller Ball Pens: * Airplane safe, ink will not explode or leak due to a change in cabin pressure during flights * Exclusive uni-flow ink system * Ink is specially formulated to become trapped in paper * Archival quality and acid-free ink * Quick drying, water-resistant ink * Stainless steel tip * Bold point * Refillable * Includes 4 pens * Color: Black